Visual Basic 6.0

Load ECC Private Key from JWK Format (JSON Web Key)

See more ECC Examples

Demonstrates how to load an ECC private key from JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

Visual Basic 6.0

Dim success As Long
success = 0

' Note: This example requires Chilkat v9.5.0.66 or later.

' First build a JWK sample to load..
Dim json As New ChilkatJsonObject
success = json.UpdateString("kty","EC")
success = json.UpdateString("crv","P-256")
success = json.UpdateString("x","oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE")
success = json.UpdateString("y","vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU")
success = json.UpdateString("d","EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM")

' The JSON contains the following:
' { 
'   "kty": "EC",
'   "crv": "P-256",
'   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
'   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
'   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
' }

' Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
json.EmitCompact = 0

' Show the JWK string to be loaded:
Dim jwkStr As String
jwkStr = json.Emit()

Dim privKey As New PrivateKey
success = privKey.LoadJwk(jwkStr)
If (success <> 1) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

' OK.. the JWK is loaded.  It can be used in whatever way desired...

' The key can be retrieved in any other format, such as XML or PEM..
Debug.Print privKey.GetXml()

' XML output:
' <ECCKeyValue curve="secp256r1">MHcCAQEEIBG1c3z52T8XwMsahGVdOZWgKCQJfv+l7djuJjgetdbDoAoGCCqGSM49AwEHoEQDQgAEoBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxG+9DLFmRSMlBQ9T/RsLLc+PmpB1+7yPAR+oR5gZn3kJQ==</ECCKeyValue>

Debug.Print privKey.GetPkcs8EncryptedPem("secret")

' PEM output
' 
' -----BEGIN ENCRYPTED PRIVATE KEY-----
' MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAiku9rUjavLQQICCAAw
' FAYIKoZIhvcNAwcECGsl/5nLai+JBIGAVIqKAdfcRQNLl1t3x+n8OZ92d1H+qgjS
' Hs83wn2joJK4nlqy+rzosZxQ3e8NTJQyUEWZWcjqMj/N0phS3QWtcD/qbda5oEcv
' QgtU60cZ4ql3truefAmlZz2PdpOfqtYhxlvjJQxnyojn4ntj69OwLOt9SZbaBQQi
' KUL8KXT4Pq8=
' -----END ENCRYPTED PRIVATE KEY-----